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JPH11136794

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DESCRIPTION JPH11136794
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer which is a flat loudspeaker.
[0002]
2. Description of the Related Art FIG. 1 is a view for explaining an electroacoustic transducer, and
FIG. 1A is a front view of the electroacoustic transducer, and FIG. 1B is a right side sectional view
of the electroacoustic transducer. 2A and 2B are diagrams for explaining the diaphragm
constituting the electroacoustic transducer, and FIG. 2A is a front view of the diaphragm, and FIG.
2B is a longitudinal sectional view of the diaphragm taken along line A-A '. FIG. 4 is a view for
explaining the wiring state of the drive coil in the conventional electroacoustic transducer.
[0003]
As shown in FIGS. 1 (A) and 1 (B), the full drive thin speaker unit A, which is an electroacoustic
transducer, includes a frame 1, a rear plate 2, a magnet 3, a pole piece 4, a guide pin 5, a voice
coil 6, A diaphragm (diaphragm) 7, a damper 8, and an edge 9 are roughly included.
By increasing the combination (segment) of the magnet 3, the voice coil 6, and the diaphragm
(diaphragm) 7, it is possible to enlarge the diaphragm area. The dimensions of this speaker unit A
are, for example, 25 mm in thickness, 115 mm in width, and 136 mm in height, and its maximum
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1
amplitude is 10 mmp-p (at 600 gf), and the input resistance is 60 W. Although only a part of the
voice coil 6 is illustrated in FIG. 1B for convenience of illustration, as described later, the bottom
of each of the top parts 7a1 to 7a7 constituting the diaphragm 7 is densely arranged. Each is
wound.
[0004]
The frame 1 is a frame formed by heat-resistant resin such as super heat-resistant ABS resin. The
frame 1 is screwed to a speaker cabinet (not shown) via screw holes 1A to 1D provided at its four
corners (the dimensions of the speaker cabinet are, for example, 60 mm in thickness, 120 mm in
width, 500 mm in height). In addition, the rear plate 2 is firmly screwed and fixed to the entire
rear surface of the frame 1 while four dampers 8 are bonded and fixed to the four corners on the
front side (the diaphragm 7 side). The four dampers 8 support the four corners of the diaphragm
7 in a freely vibrating manner.
[0005]
The rear plate 2 is a base plate which is formed of a metal plate such as iron and fixes the
longitudinal magnets 3 having the longitudinal pole pieces 4 adhered to the upper surface
thereof. A large number of air removal slits and holes are provided on the entire rear side of the
rear plate 2, and a pair of speaker terminals connected to the start end and the end of the voice
coil 6 are provided (both not shown). On the other hand, on the front side (the diaphragm 7 side)
of the rear plate 2, both ends of the longitudinal pole piece 4 to which the longitudinal magnet 3
is adhered are screwed and fixed by the guide pins 5 as described above. In the illustrated
example, seven longitudinal magnets 3 are juxtaposed parallel to one another.
[0006]
The magnet 3 is a magnet formed by sintering a ferrite such as strontium ferrite. Then, as
described above, when the magnet 3 is fixed to the front side (the diaphragm 7 side) of the rear
plate 2, one surface of the magnet 3 in contact with the rear plate 2 becomes an N pole, and the
magnet in contact with the pole piece 4. The magnet 3 is magnetized such that the other surface
(the diaphragm 7 side) of 3 is the S pole. The dimensions of the magnet 3 are, for example, 80
mm in length, 5 mm in width, and 8 mm in thickness.
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[0007]
The pole piece 4 is formed of a metal plate such as iron and has a pair of screw holes for fixing
the magnet 3 to the rear plate 2 at both ends thereof. The voice coil 6 is a coated copper wire
sequentially wound around the tops 7a1 to 7a7 constituting the diaphragm 7. As described
above, the beginning and end (not shown) of the voice coil 6 are respectively connected to a pair
of speaker terminals provided on the rear plate 2. Details of winding the voice coil 6 around the
tops 7a1 to 7a7 of the diaphragm 7 will be described later.
[0008]
The diaphragm (diaphragm) 7 is integrally molded using a polyimide (PI) film which withstands
the heat generation of the voice coil 6 and has excellent mechanical characteristics as a
diaphragm. Further, in order to reduce the weight of the diaphragm 7, it is necessary to make the
diaphragm itself as thin as possible, but the thickness of the diaphragm 7 used here is 75 μm. As
described above, the diaphragm 7 is attached to the magnet 3 and the pole piece 4 fixed on the
rear plate 2, and the periphery thereof is positioned and fixed to the frame 1 by the edge 9 made
of urethane or the like.
[0009]
The damper 8 supports the diaphragm 7 in a vibrating manner, and is made of a thermoplastic
resin such as polycarbonate, which is a substance having high spring resistance and high impact
resistance and heat resistance. In order to obtain a maximum amplitude of 10 mmp-p in a limited
space, a multistage plate spring structure is used. Since the dampers 8 are fixed to the four
corners of the frame 1, the displacement is 10 gm-p at 150 gf per damper 8. This load is received
by four end support beam structures. Further, the tensile load in the surface direction of the
diaphragm 7 is received by the connecting portion of the central portion of the damper 8. And
the beam structure is arranged in a fan shape to save space. In addition to the above, the damper
8 can also be formed of a soft member such as a foamed plastic, a cloth sealed with a plastic, or a
metal member.
[0010]
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The edge 9 firmly bonds and fixes the diaphragm 7 around its entire periphery so that the
diaphragm 7 can vibrate uniformly by the audio signal (driving current). The edge 9 is formed of
a soft member such as a foamed plastic or a cloth sealed with plastic, and is usually firmly
attached and fixed to the frame 1. As an adhesive used to bond the diaphragm 7 to the edge 9, an
epoxy resin-based or rubber-based adhesive is often used. Moreover, it may adhere | attach by
heating and pressurizing using the thermosetting type cohesion type | system | group adhesive
agent.
[0011]
Now, as shown in FIGS. 2 (A) and 2 (B), the diaphragm 7 described above is composed of a
plurality of longitudinal tops 7a1 to 7a7, a flat portion 7b, and an outer peripheral portion 7c.
7a7, the plane portion 7b, and the outer peripheral portion 7c are integrally molded. Further, the
tops 7a1 to 7a7 are formed in a curved surface convex shape (protrusion) from the back side
(rear plate 2 side) of the vibrating plate 7 to the front side, and these tops 7a1 to 7a7 are
integrated as the main vibration portion 7A. It is molded. Here, the front side of the vibrating
plate 7 is the front side of the full drive thin speaker unit A. The seven crests 7a1 to 7a7 are
arranged in parallel in the longitudinal direction of the diaphragm 7 (in the vertical direction in
FIG. 1A and FIG. 2A), and the sectional shape of each crest 7a1 to 7a7 is Except for the both
ends, in FIG. 2 (B), it is a convex shape (蒲 鉾 shape, semi-cylindrical shape) longitudinally cut by
the AA 'line. An outer peripheral portion 7c is formed around the main vibrating portion 7A.
Although only seven crests 7a1 to 7a7 are shown in the drawing, it is needless to say that the
number can be increased or decreased as needed.
[0012]
Thus, by supplying an audio signal (drive current) between the pair of speaker terminals of the
full-surface drive thin speaker unit A configured as described above, the top portions 7a1 to 7a7
of the diaphragm 7 are uniformed back and forth with respect to the paper surface. It will vibrate
on the entire surface.
[0013]
By the way, as shown in FIG. 4, in the voice coil 6, one voice coil is sequentially provided around
the tops 7a1 to 7a7 constituting the diaphragm 7 from the left to the right in the figure. It is
wound in close proximity.
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The number of turns of the voice coil 6 wound around each of the tops 7a1 to 7a7 is about 10
turns. One end of the voice coil 6 is connected to the positive terminal 10 of the pair of speaker
terminals provided on the rear plate 2, while the other end of the voice coil 6 is connected to the
negative terminal 11. The voice coils 6 wound around the tops 7a1 to 7a7 are firmly fixed to the
bottoms of the tops 7a1 to 7a7 with an adhesive or the like. As a result, even if the tops 7a1 to
7a7 vibrate largely due to the current supplied to the voice coil 6, the voice coil 6 does not
separate or drop from the bottoms of the tops 7a1 to 7a7.
[0014]
Thus, by supplying a drive current for vibrating the diaphragm 7 between the speaker terminals
10 and 11 in the direction of the arrow in FIG. 4, each of the top portions 7a1 to 7a7 vibrates
back and forth uniformly with respect to the paper surface. As a result, the diaphragm 7 vibrates
in a plane on the entire surface.
[0015]
As described above, when driving current is supplied to the voice coils 6 wound around the tops
7a1 to 7a7 arranged in parallel on the diaphragm 7, the tops 7a1 to 7c1 are provided. 7a7
vibrates back and forth with respect to the paper simultaneously, but in this case, as shown in
FIG. 2, the driving force differs between the end portions 2aa and 2ab of the top portions 7a1 to
7a7 and the vicinity of the central portion 2ac. (Driving force near both ends 2aa and 2ab>
Driving force near central portion 2ac). That is, the tops 7a1 to 7a7 have different displacement
responses.
[0016]
As a result, in the flat loudspeaker A using the conventional drive coil wiring state shown in FIG.
4 described above, smooth and preferable sound pressure frequency characteristics could not be
obtained.
[0017]
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In order to solve the problem that the present invention can not obtain a flat sound pressure in
the entire frequency band, in particular, it is wound around the ridge-shaped crests 7a1 to 7a7
arranged in parallel on the diaphragm 7 described above. The wiring state of the existing voice
coil 6 is to be changed.
Specifically, every other peak 7a1 to 7a7 arranged in a plurality in parallel, and at the tops 7a1,
7a3, 7a5, 7a7 (or the tops 7a2, 7a4, 7a6), the voice coils 6a to 6g are arranged. Roll individually.
By this, even if drive currents are supplied to the voice coils 6a to 6g and the respective tops 7a1
to 7a7 vibrate at the same time with respect to the paper surface, in this case, the tops 7a2, 7a4,
7a6 (or the tops 7a1, 1) No driving current is supplied to 7a3, 7a5 and 7a7). Therefore, as in the
conventional case, the tops 7a1 to 7a7 do not have different displacement responses. Thus, it is
an object of the present invention to provide an electroacoustic transducer capable of obtaining a
flat sound pressure in the entire frequency band by integrally vibrating the top portions 7a1 to
7a7 as the main vibration portion 7A.
[0018]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention provides an electroacoustic transducer having the following constitutions (1) to (7).
[0019]
(1) As shown in FIGS. 1 to 3, an electroacoustic transducer (full surface drive thin speaker unit)
AA for driving the entire surface of the flat plate-like diaphragm 7 is a plurality of longitudinal
projections (top portions) 7a1 to 7a7 are arranged in parallel, and around specific projections
(for example, odd-numbered tops 7a1, 7a3, 7a5, 5a7) of the plurality of projections (tops) 7a1 to
7a7 An electroacoustic transducer comprising: a voice coil 6 wound only.
[0020]
(2) In the electro-acoustic transducer (full surface drive thin speaker unit) AA according to (1), in
the plurality of projections (crests) 7a1 to 7a7 arranged in parallel on the diaphragm 7, An
electro-acoustic transducer characterized in that the voice coil 6 is wound only on odd-numbered
projections (crests 7a1, 7a3, 7a5 and 7a7).
[0021]
(3) As shown in FIGS. 1 to 3, the electroacoustic transducer (full surface drive thin speaker unit)
AA for driving the flat plate-like diaphragm 7 over the entire surface is a plurality of longitudinal
projections (top portions) 7a1 to 7a7 are arranged in parallel and wound around only a specific
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projection (the tops 7a1, 7a3, 7a5, 7a7) of the plurality of projections (the tops) 7a1 to 7a7 The
voice coil portions 6a, 6c, 6e, 6g and the voice coil portions 6a, 6c, 6e, 6g wound around only the
specific protrusions (the top portions 7a1, 7a3, 7a5, 5a7) Connection terminals (terminals) aa,
ab, ac, ad, ae, af to which one ends are respectively connected and all the voice coil portions 6a,
6c, 6e, 6g are connected in series (one voice coil 6), as before And a connection member (voice
coil 6) 6b, 6d, 6f for connecting between the connection terminals (terminal aa-terminal ab,
terminal ac-terminal ad, terminal ae-terminal af). vessel.
[0022]
(4) The electroacoustic transducer (full surface drive thin speaker unit) AA according to the
above (3), wherein the plurality of protrusions (top portions) 7a1 to 7a7 arranged in parallel on
the diaphragm 7 are odd numbers. An electro-acoustic transducer characterized in that the voice
coil portion 6 is wound only on the second protrusion (the top portions 7a1, 7a3, 7a5 and 7a7).
[0023]
(5) The electroacoustic transducer (full surface drive thin speaker unit) AA according to the
above (3 or 4), wherein the voice coil portions 6a, 6c, 6e, 6g are the specific protrusion portions
(the top portions 7a1, 7c) 7a3, 7a5, and 7a7), wherein the electro-acoustic transducer is an
annular winding unit having a predetermined number of windings (for example, 10 turns).
[0024]
(6) The electroacoustic transducer (full surface drive thin speaker unit) AA according to any one
of the above (3 to 5), wherein the connection member is a conducting wire or a resistive element.
vessel.
[0025]
(7) The electro-acoustic transducer (full surface drive thin speaker unit) AA according to 6 above,
wherein the resistance element as the connection member is between the connection terminals
(terminal aa-terminal ab, terminal ac-terminal ad, terminal An electroacoustic transducer
characterized by being connected in series or in parallel at ae-terminal af).
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION An electroacoustic transducer according to
the present invention will be described below with reference to the drawings.
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FIG. 3 is a figure for demonstrating the wiring state of the drive coil in the electroacoustic
transducer of this invention.
The same components as those described above are denoted by the same reference numerals,
and the description thereof is omitted.
[0027]
The full drive thin speaker unit AA, which is an electroacoustic transducer according to the
present invention, has substantially the same configuration as the flat speaker A shown in FIGS. 1
and 2 described above, and in particular, the voice coil 6 wound around the diaphragm 7 Is
different from the conventional full-field drive thin speaker unit A only in the wiring state of FIG.
Therefore, in the following description, only the wiring state of the voice coil 6 wound around the
diaphragm 7 will be described.
[0028]
Now, as shown in FIG. 3, the voice coil 6 (6a to 6g) is wound around the tops 7a1 to 7a7
constituting the diaphragm 7 from the left to the right in FIG. ing.
Specifically, the voice coils 6a, 6c, 6e, 6g are wound around the odd-numbered top portions 7a1,
7a3, 7a5, 7a7 of the top portions 7a1-7a7.
The voice coils 6a, 6c, 6e, 6g are wound around the tops 7a1, 7a3, 7a5, 7a7 constituting the
diaphragm 7 as shown in FIG. 3 (each top 7a1, 7a3, 7a5 and 7a7, wound about 10 turns).
Then, the voice coil 6a, 6c, 6e, 6g is covered with an adhesive filled from above the wound voice
coil 6a, 6c, 6e, 6g to the space (groove) between the tops 7a1 to 7a7. It is firmly fixed between
the parts 7a1 to 7a7.
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[0029]
On the other hand, voice coils 6a, 6c, 6e and 6g, which are annular winding units wound by a
predetermined number of turns, are individually formed in advance.
The voice coils 6a, 6c, 6e and 6g are shaped so as to be densely inserted into the tops 7a1, 7a3,
7a5 and 5a7.
The voice coil 6a, 6c, 6e, 6g of such a shape is inserted into the tops 7a1, 7a3, 7a5, 5a7 and
fitted around it (set at one time), and then this annular voice coil 6a, Also by fixing 6c, 6e, 6g, it is
possible to obtain the same fixed state as winding the voice coils 6a, 6c, 6e, 6g around the top
portions 7a1, 7a3, 7a5, 5a7. . On the other hand, the voice coil 6 is not wound around the evennumbered top portions 7a2, 7a4, 7a6.
[0030]
Although FIG. 3 shows a state in which the voice coil 6 is not tightly wound around the tops 7a1,
7a3, 7a5 and 7a7 for convenience of explanation, in the present invention, the voice coil is not
limited. It goes without saying that 6 is in a state of being tightly wound around the tops 7a1,
7a3, 7a5, 7a7.
[0031]
Specifically, after the voice coil 6a whose one end is connected to the speaker terminal 10 has
the top 7a1 wound, the other end is connected to the terminal aa.
The voice coil 6b is connected between the terminals aa and ab which are intermediate taps.
Also, after the voice coil 6c whose one end is connected to the terminal ab winds the top portion
7a3, the other end is connected to the terminal ac. The voice coil 6d is connected to the terminals
ac and ad which are intermediate taps. Furthermore, after the voice coil 6e whose one end is
connected to the terminal ad winds the top portion 7a5, the other end is connected to the
terminal ae. A voice coil 6f is connected between the terminals ae and af which are intermediate
taps. The voice coil 6g, one end of which is connected to the terminal af, winds the top portion
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7a7, and the other end is connected to the-terminal 7.
[0032]
The voice coils 6a, 5c, 5e, and 5g to be drive coils are firmly fixed by adhesive or the like around
the bottoms of the top portions 7a1, 7a3, 7a5, and 5a7 constituting the diaphragm 7. As a result,
by supplying current to the voice coil 6 (5a to 5g), even if the tops 7a1 to 7a7 vibrate largely, the
voice coil 6 (5a to 5g) is moved to the tops 7a1, 7a3, 7a5, It does not come off or come off from
the bottom of 7a7. Also, the voice coils 6b, 6d, 6f have terminals aa-ab and terminals ac-ad such
that all of the voice coils 6a, 6c, 6e, 6g are connected in series (to be one voice coil 6). , Ae-af
connecting member. As shown in FIG. 3, the voice coils 6b, 6d, 6f are connected with their
conducting wires connected in series.
[0033]
Thus, by supplying a drive current for vibrating the diaphragm 7 between the speaker terminals
10 and 11 in the direction of the arrow in FIG. 3, each of the top portions 7a1 to 7a7 vibrates
back and forth uniformly with respect to the paper surface. As a result, the diaphragm 7 vibrates
in a plane on the entire surface.
[0034]
The tops 7a2, 7a4 and 7a6 where the voice coil 6 is not wound receive the vibration of the
adjacent tops 7a1, 7a3, 7a5 and 5a7 and resonate, so that they are equal to or more than the
conventional flat loudspeaker A. Voice output can be performed at the sound pressure level. In
this case, it goes without saying that displacement responses different from each other are not
generated between the tops 7a1, 7a3, 7a5, 7a7 and the tops 7a2, 7a4, 7a6.
[0035]
As described above, the voice coil 6 is wound around the tops 7a1 to 7a7 only at the oddnumbered tops 7a1, 7a3, 7a5, and 7a7. Similarly, by winding the voice coil 6 around the evennumbered top portions 7a2, 7a4 and 7a6, the drive current for vibrating the diaphragm 7
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between the speaker terminals 10 and 11 is in the direction of the arrow in FIG. It goes without
saying that the respective top portions 7a1 to 7a7 vibrate uniformly in the back and forth
direction with respect to the paper surface by the supply, and as a result, the diaphragm 7
vibrates in a planar manner over the entire surface.
[0036]
Specifically, after the voice coil 6a whose one end is connected to the speaker terminal 10 has
the top 7a2 wound, the other end is connected to the terminal aa. The voice coil 6b is connected
between the terminals aa and ab. The voice coil 6c whose one end is connected to the terminal ab
winds the top 7a4, and the other end is connected to the terminal ac. The voice coil 6d is
connected between the terminals ac and ad. The voice coil 6e, one end of which is connected to
the terminal ad, winds the top portion 7a6, and the other end is connected to the-terminal 7.
[0037]
In the wiring state of the voice coil 6 (6a to 6g) described above, the terminals aa to af which are
intermediate taps are disposed between the speaker terminals 10 and 11, and the voice coils 6a
to 6g are connected to these terminals aa to af. By appropriately changing the connection state, it
is possible to adjust the acoustic impedance of the diaphragm 7. Specifically, all or part of voice
coils 6a, 6d, 6f connected between terminals aa and ab, between terminals ac and ad, and
between terminals ae and af between speaker terminals 10 and 11, respectively. Instead, an
appropriate number of resistance elements and their resistance values are appropriately selected,
and a plurality of selected resistance elements are connected in series or in parallel. As a result,
the acoustic impedance of the diaphragm 7 can be adjusted as needed. Furthermore, the required
acoustic impedance of the diaphragm 7 can be obtained also by selecting and using an
appropriate number and an appropriate value of coils and capacitors along with or separately
from the resistance elements as necessary. Is easily considered.
[0038]
Further, through the terminals aa to af, drive inputs of different phases can be given to the voice
coils 6a, 6c, 6e, 6g wound around the tops 7a1, 7a3, 7a5, 7a7. Thus, for example, the voice coils
6a and 6g wound around the tops 7a1 and 7a7 at both ends of the diaphragm 7 are opposed to
the voice coils 6c and 6e wound around the tops 7a3 and 7a5 near the center thereof The input
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signal supplied to the other terminals and the input signal having a predetermined delay are
added between the speaker terminal 10 and the terminal aa, and between the terminal af and the
− terminal 7. Thereby, the shape of the wave front of the sound wave radiated from the
diaphragm 7 can be adjusted, and a wave front close to a spherical wave can be realized.
Specifically, a method may be considered which is implemented by giving a delay time.
[0039]
Furthermore, the voice coils 6c and 6e wound around the tops 7a3 and 7a5 in the vicinity of the
center of the diaphragm 7 have weight relative to the voice coils 6a and 6g wound around the
tops 7a1 and 7a7 at both ends thereof. Adjust the shape of the wave front of the sound wave
emitted from the diaphragm 7 without changing the input by using a light or thick wire (or a
heavy wire or a thin wire). Can. Furthermore, it is possible to adjust the shape of the wave front
of the sound wave emitted from the diaphragm 7 without changing the input by changing the
combination of copper wire, CCA wire, aluminum wire, etc. or the thickness and number of turns
of the winding. Can.
[0040]
As a result, the flat speaker AA of the present invention can suppress the sound pressure to a dip
of at most 20 dB, particularly in the middle band (about 800 Hz to about 4 kHz). This was able to
improve the dip to about half as compared to the characteristics of the conventional flat
loudspeaker A described above. As a result, flatter sound pressure frequency characteristics can
be obtained in the midrange, and thus flat sound pressure can be obtained in all frequency bands.
[0041]
Thus, in the flat speaker AA according to the present invention described above, every other
voice coil 6 wound around the plurality of apexes 7a1 to 7a7 arranged in parallel on the
diaphragm 7 (odd-numbered apexes) By individually winding the portions 7a1, 7a3, 7a5 and
7a7, the top portions 7a1 to 7a7 can be integrally vibrated as the main vibration portion 7A, and
smooth and preferable characteristics can be obtained in all frequency bands. .
[0042]
According to the electro-acoustic transducer of the present invention having the above-described
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structure, since the driving force of the diaphragm is uniform, occurrence of undesirable
vibrations such as divided vibrations can be prevented in advance. Flat sound pressure can be
obtained in the frequency band, and, for example, the acoustic impedance of the diaphragm can
be appropriately adjusted by appropriately changing the wiring state of the voice coil wound
around each top, Furthermore, by using a light weight one for the voice coil wound around the
top, it is possible to adjust the shape of the wave front of the sound wave emitted from the
diaphragm without changing the input.
[0043]
Brief description of the drawings
[0044]
1 is a diagram for explaining an electro-acoustic transducer.
[0045]
2 is a diagram for explaining the diaphragm constituting the electro-acoustic transducer.
[0046]
3 is a diagram for explaining the wiring state of the drive coil in the electro-acoustic transducer
of the present invention.
[0047]
4 is a diagram for explaining the wiring state of the drive coil in the conventional electro-acoustic
transducer.
[0048]
Explanation of sign
[0049]
6 Voice Coils 6a, 6c, 6e, 6g Voice Coils 7a1 to 7a7 Peaks (Protrusions) A, AA Full-Side Drive Thin
Speaker Unit (Electro-Acoustic Transducer) aa to af Terminal (Connection Terminal)
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